Method for preparing ultrathin metal powder

A technology of ultra-fine metal powder and metal, which is applied in the field of preparation of ultra-fine metal powder, which can solve the problems of large particle size and low yield, and achieve the effect of small gas consumption and high cooling efficiency

Active Publication Date: 2014-01-01
四川有色金源粉冶材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing ultrafi

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  • Method for preparing ultrathin metal powder
  • Method for preparing ultrathin metal powder

Examples

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Embodiment 1

[0030] A method for preparing ultrafine pure tin powder, comprising the following steps:

[0031] A. Smelting, placing metal tin in an induction melting furnace and melting it into a molten metal at a temperature of 250-300°C;

[0032] B. Atomization, the melt obtained in step A is leaked into the atomizer through a leak bag with an aperture of 5.0mm at a flow rate of 10 kg / min for atomization. Nitrogen is used as the atomization medium during atomization. The pressure is 4.5MPa, and the medium ejection speed is 510m / s;

[0033] C. cooling, placing the tiny tin droplets gained in step B in water and water mist for cooling to obtain tiny tin particles;

[0034] D. Classifying the fine tin particles obtained in step C according to different particle size requirements, to obtain final product.

[0035] The micrograph of the obtained powder is shown in figure 1 As shown, the average particle size is 10.2 μm, of which pure tin powder with a particle size below 10 μm accounts for...

Embodiment 2

[0037] A method for preparing ultrafine pure copper powder, comprising the following steps:

[0038] A. Melting, put the red copper in the induction melting furnace, and melt it into a molten metal at a temperature of 1150°C;

[0039] B. impurity removal, add 2% Ca-Al-Si-Li-Fe refining agent of red copper quality in step A gained copper liquid, stir for 15 minutes, leave standstill for 5 minutes, remove the scum above the copper liquid, so Repeat 3 times to get pure copper liquid (impurity content 85ppm);

[0040] C. Atomization, the melt obtained in step B is leaked into the atomizer through a leak bag with an aperture of 5.0mm at a flow rate of 15 kg / min for atomization. Nitrogen is used as the atomization medium during atomization. The pressure is 4.2MPa, and the medium ejection speed is 490m / s;

[0041] D. cooling, placing the fine copper droplets obtained in step C in a liquid nitrogen mist cooling medium for cooling to obtain fine pure copper particles;

[0042] E. cl...

Embodiment 3

[0045] A method for preparing ultrafine iron-silicon soft magnetic powder, comprising the following steps:

[0046] A. Melting, the mixture of Fe and Si (the Si content is 6.5wt.%, Fe is the balance) is placed in an induction melting furnace, and melted into a molten metal at a temperature of 1600 ° C;

[0047]B. Impurity removal, add 2% Ca-Al-Si-Li-Fe refining agent of the total mass of Fe and Si mixture to the alloy melt obtained in step A, stir for 15 minutes, let stand for 5 minutes, and remove the alloy melt For the scum above, repeat this 3 times to get a pure iron-silicon alloy melt (the impurity content is 89ppm);

[0048] C. Atomization, the melt obtained in step B is leaked into the atomizer through a leak bag with an aperture of 5.0mm at a flow rate of 12 kg / min for atomization. Water is used as the atomization medium during atomization, and the atomization water pressure It is 120MPa, the water flow rate is 2.35 liters per second, and the water jetting speed is 12...

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Abstract

The invention provides a method for preparing ultrathin metal powder and belongs to the field of material preparation. The method comprises the steps of smelting, atomization, cooling, solid-liquid separation and the like. In the step of atomization, one or more of water, nitrogen, helium and argon serves/serve as an atomizing medium. According to the method, the metal powder or alloy powder with the grain size smaller than 10 micrometers is basically obtained, the ratio of the metal powder or the alloy powder with the grain size smaller than 10 micrometers is over 50%, the sphericity of the obtained metal powder or the alloy powder is over 90%, the oxygen content is smaller than 100ppm, the gas consumption is small, the cooling efficiency is high, and the requirements for devices are low. The method for preparing the ultrathin metal powder is capable of satisfying the requirements of the metal powder or the alloy powder used for injection forming, thermal spraying, thermal spray welding and 3D printing.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a method for preparing ultrafine metal powder. Background technique [0002] Ultrafine metal powder is used in almost all industries of the national economy. It is the basis for transforming and promoting the development of emerging industries such as paint and coatings, information recording media, fine ceramics, electronic technology, new materials, powder metallurgy, 3D printing and biotechnology. [0003] At present, the methods for preparing ultrafine metal powder mainly include ball milling, jet mill pulverization, plasma rotating electrode method, physical chemical method and gas atomization method. [0004] Among them, the gas atomization method is one of the main methods for producing ultrafine metal and alloy powders. The basic principle of gas atomization is the process of breaking the liquid metal flow into small droplets and solidifying into powder with high-spee...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 陈伟冯再蒋赐进周森
Owner 四川有色金源粉冶材料有限公司
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